vpp: T8438: Add bidirectional interface-in-use validation

Add bidirectional VPP interface reference validation: prevent assigning an interface used by a VPP feature (NAT/ACL/IPFIX/sFlow, etc.)
as a VPP member (bond/bridge/xconnect) and prevent using a VPP member interface in VPP features.
Block interface deletion when it is still referenced by any VPP feature/member.
Fix VLAN subinterface removal checks broken by the recent VPP config tree restructuring.

1 files changed, 14 insertions, 0 deletions

diff --git a/smoketest/scripts/cli/test_vpp.py b/smoketest/scripts/cli/test_vpp.py
index d4238f68c..8fcd541f0 100755
--- a/smoketest/scripts/cli/test_vpp.py
+++ b/smoketest/scripts/cli/test_vpp.py
@@ -873,6 +873,13 @@ class TestVPP(VyOSUnitTestSHIM.TestCase):
         lines = out.split('\n')
         self.assertTrue(len(lines) == 3)
 
+        # Cannot remove inside/outside interface from vpp while it is used in the feature
+        # expect raise ConfigError
+        self.cli_delete(base_bond + [iface_bond, 'vif', vif_1])
+        with self.assertRaises(ConfigSessionError):
+            self.cli_commit()
+        self.cli_discard()
+
     def test_14_vpp_nat44(self):
         base_nat = base_path + ['nat', 'nat44']
         exclude_local_addr = '100.64.0.52'
@@ -1018,6 +1025,13 @@ class TestVPP(VyOSUnitTestSHIM.TestCase):
         for expected_entry in expected_entries:
             self.assertIn(expected_entry, out)
 
+        # Cannot remove interface from vpp while it is used in the feature
+        # expect raise ConfigError
+        self.cli_delete(base_path + ['settings', 'interface', iface_2])
+        with self.assertRaises(ConfigSessionError):
+            self.cli_commit()
+        self.cli_discard()
+
         # cannot delete system sFlow configuration if VPP sFlow is configured
         # expect raise ConfigError
         self.cli_delete(base_sflow)